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Nuclei MCQs For NEET

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Free download in PDF Class 12 Physics Chapter 13 Nuclei Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>

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(1) The helium atom does not contain
[A] two protons
[B] two electrons
[C] two neutrons
[D] six nucleons
Answer: six nucleons
(2) Energy of electron in the 1st orbit of H-atom is:
[A] -13.6 MeV
[B] -13.6 eV
[C] -13.6 J
[D] 13.6 J
Answer: -13.6 eV

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(3) Mass is converted into energy according to the relation:
[A] E = me²
[B] E = mgh
[C]
[D]
Answer: E = me²
(4) The isotope generally used for the treatment of cancer is:
[A] I131
[B] Hg197
[C] O15
[D] Co60
Answer: Co60
(5) Which of the following atoms has the lowest ionization potential?
[A]
[B]
[C]
[D]
Answer: C
(6) Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. Find the ration of remaining number of A and B nuclei after 80 minutes.
[A] 1 : 1
[B] 4 : 1
[C] 1 : 4
[D] 1 : 16
Answer: 1 : 4
(7) The binding energy per nucleon for the parent nucleus is E1 and that for the daughter nuclei is E2. Then
[A] E1 > E2 
[B] E2 > E2
[C] E1 = 2E2
[D] E2 = 2E1
Answer: E2 > E2
(8) In a sample off radioactive substance, what percentage decays in one mean life time?
[A] 70 %
[B] 63.2 %
[C] 45.8 %
[D] 23%
Answer: 63.2 %
(9) The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
[A] isobar of parent
[B] isomer of parent
[C] isotone of parent
[D] isotope of parent
Answer: isotope of parent
(10) A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme :

If the mass number and atomic number of A are 180 and 72 respectively then the mass number and atomic number for A4 are

[A] 69 and 172 respectively
[B] 115 and 71 respectively
[C] 172 and 69 respectively
[D] None of these
Answer: 172 and 69 respectively
(11) The half life period of a radioactive material if its activity drops to (1/16)th of its initial value in 30 years is
[A] 1.5 years
[B] 3.5 years
[C] 7.5 years
[D] 15 years
Answer: 7.5 years
(12) There are 106 radioactive nuclei in a given radioactive element. Its half life is 20 seconds. The number of nuclei will remain left after 10 seconds are:
[A] 3 × 106
[B] 3 × 105
[C] 7 × 105
[D] 2 × 105
Answer: 7 × 105
(13) The ratio of nuclear radii and nuclear densities of 26Fe56 and 92U238 is
[A] 0.671 and 1 respectively
[B] 1 and 0.671 respectively
[C] both equal to 1
[D] both equal to 0.671
Answer: 0.671 and 1 respectively
(14) Artificial radioactivity was discovered by
[A] Klaproth
[B] Rontgen
[C] Irene Curie and Joliot
[D] P. Curie and M. Curie
Answer: Irene Curie and Joliot
(15) Radioactive samples are stored in lead boxes because it is
[A] heavy
[B] strong
[C] good absorber
[D] bad conductor
Answer: good absorber
(16) Which of the following is not a mode of radioactive decay ?
[A] Positron emission
[B] Electron capture
[C] Fusion
[D] Alpha decay
Answer: Fusion
(17) Beta rays emitted by a radioactive material are
[A] electromagnetic radiations
[B] the electrons orbiting around the nucleus
[C] charged particles emitted by nucleus
[D] neutral particles
Answer: charged particles emitted by nucleus
(18) γ-rays are deflected by
[A] an electric field but not by a magnetic field
[B] a magnetic field but not by an electric field
[C] both electric and magnetic field
[D] neither by electric field nor by magnetic field
Answer: neither by electric field nor by magnetic field
(19) The antiparticle of electron is
[A] positron
[B] α-particle
[C] proton
[D] β-particle
Answer: positron
(20) Nuclear forces are
[A] spin dependent and have no non-central part
[B] spin dependent and have a non-central part
[C] spin independent and have no non-central part
[D] spin independent and have a non-central part
Answer: spin dependent and have a non-central part

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